A toxic algal bloom, popularly referred to as red tide, is seen in waters near Rizhao, a city in east China's Shandong Province, on May 7, 2012. Five blocks of red tide have been detected in waters near Rizhao, according to a notice issued Saturday by the State Oceanic Administration (SOA). The SOA uses satellite remote-sensing technology, patrol vessels and helicopters to monitor the phenomenon (XINHUA) |